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| Author | SHA1 | Date |
|---|---|---|
 Eduard Iten
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bb45ee736b | |
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Eduard Iten
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08a7037b26 | |
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Eduard Iten
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7d67186380 |
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# Auslegung: 12V auf 3.3V Step-Down mit SY8120IABC
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Dieses Dokument beschreibt das Design eines hocheffizienten, synchronen DC/DC-Abwärtswandlers. Es ist eine moderne Alternative zu älteren Designs wie dem TPS5430.
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## 1. Design-Ziele
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* **Eingangsspannung ($V_{in}$):** 12V (Bereich 10.5V - 14V)
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* **Ausgangsspannung ($V_{out}$):** 3.3V
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* **Ausgangsstrom ($I_{out}$):** Ausgelegt für ca. 0.5A, mit Reserven bis 2A.
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* **Kernbaustein:** Silergy SY8120IABC (Synchron, 1MHz, bis 18V, 2A)
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* **Ziele:** Hohe Effizienz, kompaktes Layout, minimale Anzahl externer Bauteile (keine externe Diode).
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## 2. Auslegung der Bauteile
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Die Berechnung der externen Komponenten basiert auf dem Datenblatt des SY8120IABC.
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### a) Feedback-Widerstände (R1, R2)
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Der SY8120IABC hat eine Referenzspannung ($V_{FB}$) von **0.6V**. Die Formel zur Einstellung der Ausgangsspannung lautet:
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$V_{out} = V_{FB} \times (1 + \frac{R1}{R2})$
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Um eine stabile Schleife zu gewährleisten, wird für R2 ein Wert zwischen 10kΩ und 100kΩ empfohlen.
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* Wir wählen: **`R2 = 49.9 kΩ`** (1%, E96-Reihe)
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* Daraus berechnet sich R1:
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$R1 = R2 \times (\frac{V_{out}}{V_{FB}} - 1) = 49.9kΩ \times (\frac{3.3V}{0.6V} - 1) = 49.9kΩ \times 4.5 = 224.55kΩ$
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* Der nächstgelegene Standardwert ist: **`R1 = 226 kΩ`** (1%, E96-Reihe)
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Die resultierende Ausgangsspannung beträgt damit $V_{out} = 0.6V \times (1 + \frac{226k}{49.9k}) \approx 3.317V$, was eine exzellente Annäherung an 3.3V ist.
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### b) Induktivität (L1)
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Durch die hohe Schaltfrequenz von 1 MHz kann eine physisch kleine Spule mit geringerer Induktivität verwendet werden. Das Datenblatt empfiehlt Werte im Bereich von 2.2µH bis 10µH.
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* Wir wählen einen Wert von **`L1 = 4.7 µH`**.
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* **Wichtig:** Der Sättigungsstrom ($I_{sat}$) muss über der Strombegrenzung des ICs liegen (ca. 3A). Eine Spule mit **$I_{sat} > 3A$** wird gewählt.
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### c) Kondensatoren (C1, C2, C3)
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* **Eingangskondensator (C1):** Ein **`10µF / 25V`** Keramikkondensator (0805) ist ausreichend, um die Eingangsspannung zu stabilisieren.
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* **Ausgangskondensator (C2):** Ein **`22µF / 10V`** Keramikkondensator (0805) wird für eine stabile Ausgangsspannung mit geringem Ripple empfohlen.
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* **Bootstrap-Kondensator (C3):** Wie im Datenblatt spezifiziert, wird ein **`100nF`** Kondensator zwischen die Pins BOOT und SW geschaltet.
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## 3. Finale Stückliste (BOM) für LCSC/JLCPCB
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Diese Liste wurde auf Verfügbarkeit geprüft (Stand: 24. Juni 2025).
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| Bauteil (Ref) | Wert | LCSC Part # | Gehäuse | JLCPCB Status | Hinweis |
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| :--- | :--- | :--- | :--- | :--- | :--- |
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| **IC1** | **SY8120IABC**| `C479076` | SOT23-6 | Extended Part | Synchroner Step-Down Regler. |
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| **L1** | **4.7 µH** | `C320925` | 6.3x6.3mm | Extended Part | Chilisin BPCI0603F-4R7M-P2. Isat=3.1A, DCR=45mΩ. |
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| **C1 (Eingang)**| **10 µF, 25V** | `C1585` | 0805 | Basic Part | Samsung CL21A106KQFNNNE. So nah wie möglich an VIN/GND des ICs. |
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| **C2 (Ausgang)**| **22 µF, 10V** | `C15951` | 0805 | Basic Part | Samsung CL21A226MQCLRNC. Nah am Ausgang der Spule platzieren. |
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| **C3 (Bootstrap)**| **100 nF, 50V** | `C1508` | 0402 | Basic Part | Yageo CC0402KRX7R9BB104. Direkt zwischen BOOT und SW Pins. |
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| **R1** | **226 kΩ, 1%**| `C25995` | 0402 | Basic Part | UNI-ROYAL 0402WGF2263TCE. Feedback-Widerstand (oben). |
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| **R2** | **49.9 kΩ, 1%**| `C25900` | 0402 | Basic Part | UNI-ROYAL 0402WGF4992TCE. Feedback-Widerstand (unten). |
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## 4. Wichtige Hinweise zum Layout
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Für einen hochfrequenten Wandler (1MHz) ist ein gutes Layout noch wichtiger als sonst.
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1. **Kritischer Loop (Eingang):** Der Pfad vom Eingangskondensator `C1` zum `VIN`-Pin des ICs und vom `GND`-Pin des ICs zurück zu `C1` muss absolut minimal sein. Kurze, breite Leiterbahnen sind hier Pflicht.
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2. **SW (Schaltknoten):** Der Pin `SW` (Switch) führt die hochfrequent geschaltete Spannung. Die Leiterbahn von diesem Pin zur Spule `L1` sollte kurz und breit sein, aber von empfindlichen Signalen (wie der Feedback-Leitung) ferngehalten werden.
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3. **Feedback-Pfad:** Die Widerstände `R1` und `R2` sollten nah am `FB`-Pin des ICs platziert werden. Die Leiterbahn vom `FB`-Pin zum Widerstandsteiler sollte kurz sein und nicht parallel zu lauten Leiterbahnen (wie SW) geführt werden.
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4. **Masseführung:** Eine durchgehende Massefläche unter den Komponenten ist die beste Lösung, um die Rückströme kurz zu halten und die thermische Anbindung zu verbessern.
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@ -0,0 +1,2 @@
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(kicad_pcb (version 20241229) (generator "pcbnew") (generator_version "9.0")
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@ -0,0 +1,5 @@
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"td_allow_use_two_tracks": true,
|
||||
"td_curve_segcount": 0,
|
||||
"td_height_ratio": 1.0,
|
||||
"td_length_ratio": 0.5,
|
||||
"td_maxheight": 2.0,
|
||||
"td_maxlen": 1.0,
|
||||
"td_on_pad_in_zone": false,
|
||||
"td_target_name": "td_track_end",
|
||||
"td_width_to_size_filter_ratio": 0.9
|
||||
}
|
||||
],
|
||||
"track_widths": [],
|
||||
"via_dimensions": []
|
||||
}
|
||||
"tuning_pattern_settings": {
|
||||
"diff_pair_defaults": {
|
||||
"corner_radius_percentage": 80,
|
||||
"corner_style": 1,
|
||||
"max_amplitude": 1.0,
|
||||
"min_amplitude": 0.2,
|
||||
"single_sided": false,
|
||||
"spacing": 1.0
|
||||
},
|
||||
"diff_pair_skew_defaults": {
|
||||
"corner_radius_percentage": 80,
|
||||
"corner_style": 1,
|
||||
"max_amplitude": 1.0,
|
||||
"min_amplitude": 0.2,
|
||||
"single_sided": false,
|
||||
"spacing": 0.6
|
||||
},
|
||||
"single_track_defaults": {
|
||||
"corner_radius_percentage": 80,
|
||||
"corner_style": 1,
|
||||
"max_amplitude": 1.0,
|
||||
"min_amplitude": 0.2,
|
||||
"single_sided": false,
|
||||
"spacing": 0.6
|
||||
}
|
||||
},
|
||||
"via_dimensions": [],
|
||||
"zones_allow_external_fillets": false
|
||||
},
|
||||
"ipc2581": {
|
||||
"dist": "",
|
||||
"distpn": "",
|
||||
"internal_id": "",
|
||||
"mfg": "",
|
||||
"mpn": ""
|
||||
},
|
||||
"layer_pairs": [],
|
||||
"layer_presets": [],
|
||||
"viewports": []
|
||||
},
|
||||
"boards": [],
|
||||
"cvpcb": {
|
||||
"equivalence_files": []
|
||||
},
|
||||
"erc": {
|
||||
"erc_exclusions": [],
|
||||
"meta": {
|
||||
"version": 0
|
||||
},
|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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|
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
2,
|
||||
2,
|
||||
2
|
||||
]
|
||||
],
|
||||
"rule_severities": {
|
||||
"bus_definition_conflict": "error",
|
||||
"bus_entry_needed": "error",
|
||||
"bus_to_bus_conflict": "error",
|
||||
"bus_to_net_conflict": "error",
|
||||
"different_unit_footprint": "error",
|
||||
"different_unit_net": "error",
|
||||
"duplicate_reference": "error",
|
||||
"duplicate_sheet_names": "error",
|
||||
"endpoint_off_grid": "warning",
|
||||
"extra_units": "error",
|
||||
"footprint_filter": "ignore",
|
||||
"footprint_link_issues": "warning",
|
||||
"four_way_junction": "ignore",
|
||||
"global_label_dangling": "warning",
|
||||
"hier_label_mismatch": "error",
|
||||
"label_dangling": "error",
|
||||
"label_multiple_wires": "warning",
|
||||
"lib_symbol_issues": "warning",
|
||||
"lib_symbol_mismatch": "warning",
|
||||
"missing_bidi_pin": "warning",
|
||||
"missing_input_pin": "warning",
|
||||
"missing_power_pin": "error",
|
||||
"missing_unit": "warning",
|
||||
"multiple_net_names": "warning",
|
||||
"net_not_bus_member": "warning",
|
||||
"no_connect_connected": "warning",
|
||||
"no_connect_dangling": "warning",
|
||||
"pin_not_connected": "error",
|
||||
"pin_not_driven": "error",
|
||||
"pin_to_pin": "warning",
|
||||
"power_pin_not_driven": "error",
|
||||
"same_local_global_label": "warning",
|
||||
"similar_label_and_power": "warning",
|
||||
"similar_labels": "warning",
|
||||
"similar_power": "warning",
|
||||
"simulation_model_issue": "ignore",
|
||||
"single_global_label": "ignore",
|
||||
"unannotated": "error",
|
||||
"unconnected_wire_endpoint": "warning",
|
||||
"unit_value_mismatch": "error",
|
||||
"unresolved_variable": "error",
|
||||
"wire_dangling": "error"
|
||||
}
|
||||
},
|
||||
"libraries": {
|
||||
"pinned_footprint_libs": [],
|
||||
"pinned_symbol_libs": []
|
||||
},
|
||||
"meta": {
|
||||
"filename": "kicad.kicad_pro",
|
||||
"version": 1
|
||||
"filename": "TPS5430DDAR_3V3_0A5_Converter.kicad_pro",
|
||||
"version": 3
|
||||
},
|
||||
"net_settings": {
|
||||
"classes": [],
|
||||
"classes": [
|
||||
{
|
||||
"bus_width": 12,
|
||||
"clearance": 0.2,
|
||||
"diff_pair_gap": 0.25,
|
||||
"diff_pair_via_gap": 0.25,
|
||||
"diff_pair_width": 0.2,
|
||||
"line_style": 0,
|
||||
"microvia_diameter": 0.3,
|
||||
"microvia_drill": 0.1,
|
||||
"name": "Default",
|
||||
"pcb_color": "rgba(0, 0, 0, 0.000)",
|
||||
"priority": 2147483647,
|
||||
"schematic_color": "rgba(0, 0, 0, 0.000)",
|
||||
"track_width": 0.2,
|
||||
"via_diameter": 0.6,
|
||||
"via_drill": 0.3,
|
||||
"wire_width": 6
|
||||
},
|
||||
{
|
||||
"clearance": 0.2,
|
||||
"name": "Power",
|
||||
"pcb_color": "rgba(0, 0, 0, 0.000)",
|
||||
"priority": 0,
|
||||
"schematic_color": "rgba(0, 0, 0, 0.000)",
|
||||
"track_width": 1.0,
|
||||
"via_diameter": 1.0,
|
||||
"via_drill": 0.75
|
||||
}
|
||||
],
|
||||
"meta": {
|
||||
"version": 0
|
||||
}
|
||||
"version": 4
|
||||
},
|
||||
"net_colors": null,
|
||||
"netclass_assignments": null,
|
||||
"netclass_patterns": [
|
||||
{
|
||||
"netclass": "Power",
|
||||
"pattern": "/V*"
|
||||
}
|
||||
]
|
||||
},
|
||||
"pcbnew": {
|
||||
"last_paths": {
|
||||
"gencad": "",
|
||||
"idf": "",
|
||||
"netlist": "",
|
||||
"plot": "",
|
||||
"pos_files": "",
|
||||
"specctra_dsn": "",
|
||||
"step": "",
|
||||
"svg": "",
|
||||
"vrml": ""
|
||||
},
|
||||
"page_layout_descr_file": ""
|
||||
},
|
||||
"sheets": [],
|
||||
"schematic": {
|
||||
"annotate_start_num": 0,
|
||||
"bom_export_filename": "${PROJECTNAME}.csv",
|
||||
"bom_fmt_presets": [],
|
||||
"bom_fmt_settings": {
|
||||
"field_delimiter": ",",
|
||||
"keep_line_breaks": false,
|
||||
"keep_tabs": false,
|
||||
"name": "CSV",
|
||||
"ref_delimiter": ",",
|
||||
"ref_range_delimiter": "",
|
||||
"string_delimiter": "\""
|
||||
},
|
||||
"bom_presets": [],
|
||||
"bom_settings": {
|
||||
"exclude_dnp": false,
|
||||
"fields_ordered": [
|
||||
{
|
||||
"group_by": false,
|
||||
"label": "Reference",
|
||||
"name": "Reference",
|
||||
"show": true
|
||||
},
|
||||
{
|
||||
"group_by": false,
|
||||
"label": "Qty",
|
||||
"name": "${QUANTITY}",
|
||||
"show": true
|
||||
},
|
||||
{
|
||||
"group_by": true,
|
||||
"label": "Value",
|
||||
"name": "Value",
|
||||
"show": true
|
||||
},
|
||||
{
|
||||
"group_by": true,
|
||||
"label": "DNP",
|
||||
"name": "${DNP}",
|
||||
"show": true
|
||||
},
|
||||
{
|
||||
"group_by": false,
|
||||
"label": "LCSC PN",
|
||||
"name": "LCSC PN",
|
||||
"show": true
|
||||
},
|
||||
{
|
||||
"group_by": true,
|
||||
"label": "Exclude from BOM",
|
||||
"name": "${EXCLUDE_FROM_BOM}",
|
||||
"show": true
|
||||
},
|
||||
{
|
||||
"group_by": true,
|
||||
"label": "Exclude from Board",
|
||||
"name": "${EXCLUDE_FROM_BOARD}",
|
||||
"show": true
|
||||
},
|
||||
{
|
||||
"group_by": true,
|
||||
"label": "Footprint",
|
||||
"name": "Footprint",
|
||||
"show": true
|
||||
},
|
||||
{
|
||||
"group_by": false,
|
||||
"label": "Datasheet",
|
||||
"name": "Datasheet",
|
||||
"show": true
|
||||
},
|
||||
{
|
||||
"group_by": false,
|
||||
"label": "Beschreibung",
|
||||
"name": "Description",
|
||||
"show": false
|
||||
},
|
||||
{
|
||||
"group_by": false,
|
||||
"label": "#",
|
||||
"name": "${ITEM_NUMBER}",
|
||||
"show": false
|
||||
}
|
||||
],
|
||||
"filter_string": "",
|
||||
"group_symbols": true,
|
||||
"include_excluded_from_bom": true,
|
||||
"name": "",
|
||||
"sort_asc": true,
|
||||
"sort_field": "Reference"
|
||||
},
|
||||
"connection_grid_size": 50.0,
|
||||
"drawing": {
|
||||
"dashed_lines_dash_length_ratio": 12.0,
|
||||
"dashed_lines_gap_length_ratio": 3.0,
|
||||
"default_line_thickness": 6.0,
|
||||
"default_text_size": 50.0,
|
||||
"field_names": [],
|
||||
"intersheets_ref_own_page": false,
|
||||
"intersheets_ref_prefix": "",
|
||||
"intersheets_ref_short": false,
|
||||
"intersheets_ref_show": false,
|
||||
"intersheets_ref_suffix": "",
|
||||
"junction_size_choice": 3,
|
||||
"label_size_ratio": 0.375,
|
||||
"operating_point_overlay_i_precision": 3,
|
||||
"operating_point_overlay_i_range": "~A",
|
||||
"operating_point_overlay_v_precision": 3,
|
||||
"operating_point_overlay_v_range": "~V",
|
||||
"overbar_offset_ratio": 1.23,
|
||||
"pin_symbol_size": 25.0,
|
||||
"text_offset_ratio": 0.15
|
||||
},
|
||||
"legacy_lib_dir": "",
|
||||
"legacy_lib_list": [],
|
||||
"meta": {
|
||||
"version": 1
|
||||
},
|
||||
"net_format_name": "",
|
||||
"page_layout_descr_file": "",
|
||||
"plot_directory": "",
|
||||
"space_save_all_events": true,
|
||||
"spice_current_sheet_as_root": false,
|
||||
"spice_external_command": "spice \"%I\"",
|
||||
"spice_model_current_sheet_as_root": true,
|
||||
"spice_save_all_currents": false,
|
||||
"spice_save_all_dissipations": false,
|
||||
"spice_save_all_voltages": false,
|
||||
"subpart_first_id": 65,
|
||||
"subpart_id_separator": 0
|
||||
},
|
||||
"sheets": [
|
||||
[
|
||||
"6d1e4ef9-7207-43df-b031-faa1803bd859",
|
||||
"Root"
|
||||
]
|
||||
],
|
||||
"text_variables": {}
|
||||
}
|
||||
|
|
|
|||
File diff suppressed because it is too large
Load Diff
|
|
@ -0,0 +1 @@
|
|||
{"ARCHIVE_NAME": "", "EXTRA_LAYERS": "", "ALL_ACTIVE_LAYERS": false, "EXTEND_EDGE_CUT": false, "ALTERNATIVE_EDGE_CUT": false, "AUTO TRANSLATE": true, "AUTO FILL": true, "EXCLUDE DNP": false}
|
||||
Loading…
Reference in New Issue